My photo survey of the Tucson USHCN climate station is still creating a lot of discussion. Discussion, for example, is here, here, and here.

And you too can have the satisfaction of contributing to science. All
you need is a camera (a GPS of some sort is also helpful). I wrote a
post with instructions on how to find temperature stations near you and how to document them for science here. Believe it or not, for all the work and money spent on global warming,
this is something that no one had done -- actually go document these
sites to check their quality and potential biases.